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Old 03-22-2010, 09:48 AM
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Torque converter dilema

I have a converter dilema. I just swapped cams in my 79 Malibu. The motor is a 402 BBC with a comp xe268 cam, wieand stealth with a 750 vacuum secondary carb and small headers. Car weighs around 3400 and has 3.73 gears with a th350 trans. Now here's my dilema, the stock converter is now too tight. I have to idle the motor to around 1200 so it doesn't die in gear, I have an old summit g2700 converter I bought a long time ago in the box still, it's supose to stall around 1900. I don't know if it's enough. I can get a "white box" converter from the local speed shop that is supose to stall between 2400-2600 for around $130. Or I called fti converters that is local to me and has a good rep in the racing comunity, they will build one for around $300. That's a little more than I want to spend on this trans though. And they recamended around 2500-2800. So what do I do?

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Old 03-22-2010, 10:01 AM
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To get the most out of the cam and engine, you need a 2500 stall TC, IMHO.

Comp will say a stock TC will work- but they also say the same things about the same cam AFA idle quality, and vacuum for the 396 as they do the 454, so go figure.
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Old 03-22-2010, 10:23 AM
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I'm thinking about getting the speed shop converter for $130. I know it's proably not the best but I don't plan on keeping the th350 forever, I have a 700 sitting in the corner but I'm putting that off till I decide if I'm keeping the 7.5 or going to a 9" but that's another story
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Old 03-22-2010, 10:45 AM
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Quote:
Originally Posted by Phoneguy
I'm thinking about getting the speed shop converter for $130. I know it's proably not the best but I don't plan on keeping the th350 forever, I have a 700 sitting in the corner but I'm putting that off till I decide if I'm keeping the 7.5 or going to a 9" but that's another story
Obviously, for $130 you can't expect more than tweaked fins. But it will help a lot w/the idle creep.

Don't hit it w/any NO2 and if you don't ask too much from it, hopefully it'll be OK until you do a tranny swap.
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Old 03-22-2010, 02:53 PM
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My cheapness is kicking in. I'm starting to think about useing the summit converter I have laying around. I know it's far from ideal but I hoping it's loose enough to lower the idle down
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Old 03-22-2010, 05:41 PM
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Go for it.
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Old 03-23-2010, 12:59 AM
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I've posted a number of times exactly what happened in my car under almost the same conditions. Hot cam, fast idle and tight converter. To fix the idle problem I think a 3000 converter is the way to go. A little lower will definitely help over the current situation, the cheap way will help but not totally fix it. I too suspect the cheap converter lifespan will be shorter. Frankly I peddle it and get a better one.

If you go to a 700r you will still have the same problem until you get a looser converter. They work great on the street. It might seem a little squishy at first but you will quickly get used to it. The higher stall will also allow your motor to come alive quicker and easier as it will get into and stay in the 2500+ range where the torque starts coming on.
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Old 03-23-2010, 09:07 PM
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Well it's a good thing I decided to change the converter, the old one was balloned. I unbolted it from the flexplate and it would only push back about 1/16". But the other converter I had didn't really solve my problem but I'll just suck it up for now. However on a better note when I had the trans apart I found stamps with the milage and date of a rebuild. It was rebuilt at 115000 and on 3/22/85. The car now shows 134000, so it hasn't been driven much since 85
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